Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4918de53fdd9e9…

MALICIOUS

PDF

137.0 KB Created: 2021-08-17 03:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7a541497a1f08818dd772695a7bf8bd8 SHA-1: d6449fe411dfdfc9c80cb4cc176539d477aef8c8 SHA-256: 8c4918de53fdd9e9d7ea34c94c66ded687e44de6efed2e2afcea20f66637168e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.contectrade.hu/fckfiles/file/84362458259.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e35e85da1---gigupijoluza.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/idru3sspf54mk87fnd211erhga/watedejenipufil.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/98dda3d2882108fb8386dcff12e66c5e/rokuxabokowagifinaruvev.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b29c9d94465---36519774377.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/13488297401.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/mimopidirebopuwe.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/f4rudrttu6bm309e17j3gchi44/95039663679.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/17fddb0f9459ccb6ecd1797f8c331608/xumovusonani.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/wumurared.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lefigurimujimudesirulujel.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/kop8dr31h7fhljuaftbd080p04/10824307199.pdfIn PDF document text
    • https://pbpkrosno.com/fckfile/digoromijibi.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/15274108753.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e2b7ef43---toralogolitufosadara.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/93494469901.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/dowafewijoxomufas.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/goxarifipate.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vraibt613aifvlrd96moqccas8/xapadonomotido.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/98740894265.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/2e7929f73ebae1c88ac8724e729c796f/rifukatenifalewel.pdfIn PDF document text
    • http://rubensova16.cz/files/file/weramelano.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/zoworesixafutigokudore.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/31992158273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=iodine+clock+reaction+lab+answers+cheggPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001abb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB6 10916 bytes
SHA-256: 40f620c6ff655589b13a67bcf5e1e8e21597e31b6f8de77104939116a9b650d7
font_01_sfnt_off0001c4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C4BD 20908 bytes
SHA-256: 5c3f2a5f69e9146ea0297f8ae8ea7bf087401d9e811af8938fe7cd8cdeabe78c
font_02_sfnt_off0001fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FD22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1